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What causes the error “java.lang.UnsupportedOperationException: this is not a URI node” in the DIG reasoner?

April 26, 2017causes Dig Error Node reasoner URI

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What causes the error “java.lang.UnsupportedOperationException: this is not a URI node” in the DIG reasoner?

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This is a known problem with the Jena 2.1 release. Please get the latest version of Jena (a later release, if there is one, or get the sources from CVS and build a new copy of jena.jar.